Air-cooled supercharged combustion engine



Patented Nov. 14, 1950 AIR-OOOLED SUPEBCHARGED COMBUSTION ENGINE Hans Wiederkehr, -Zurich, and Ren Feiss, Winterthur, Swlt'zerland, assignors to Schweizerische Lokomotivund Maschinenfabrl1x, Winterthur, Switzerland Application November 19, 1945, Serial N0. 628,278 In Switzerland November 13, 1944 1 Claim.

This invention relates to improvements in aircooled supercharged internal combustion engines cooled by an axial blower and supetcharged by a radial blower, and consists in that the two blower impellers are secured to a common shaftassembly, the cooling blower supplying the air to be drawn into the supercharging blower.

The annexed drawing illustrates, by way cf example, one embodiment of the present invention, in which Fig. 1 is a horizontal section of a vertical motor with cylinders in line, and with the blowers in Pla Fig. 2 a cross-section through the motor on the line II--II of Fig. 1;

Fig. 3 a partial horizontal section of an embodiment comprising a gas turbine;

Fig. 4 a partial horozizontal section of a modification comprising a resilient couplng; and

Fig. 5 a cross section, in a larger scale, of the latter.

As represented in the drawing the engine has a plurality of vertically disposed cylinders I arranged in line. Numeral 2 designates an engine flywheel. The blowers are operated from the flywheel-side of the motor, where the speed variations are smallest, by way of a gear wheel 3 secured to the flywheel 2, an intermediate spur wheel I'I, and a pinion 4 keyed to the shaft 5 running longitudinal of the motor besides the cylindem. The said shaft 5 may be adapted as a torsion-spring rod, and carries the cooling-blower impeller 6 keyed thereon, and its end is mounted in the bearing 8 which is fixedly secured to the suction iunnel I which opens into a cowling enclosing at least substantial parts of the engine cylinders. The supercharging-blower impeller 9 is loosely mounted on the shaft 5, and flxedly connected to the cooling blower impeller Ii by means of the tube I0.

The cooling blower impeller 6 sucks outside air through a filter and. suction silencer I8 in the direction of the arrows I9 and ejects it into the space 29 provided within the cowling. From the latter, part of the air fiows toward the cooling flns II of the cylinders I, and the remainder to the supercharging blower 9. The latter supplies the air required for super-charging and scavenging th cylinders I, which is fed to the cylinders through the duct I2, partly shown by dash-anddot lines, in the direction of the arrows I3, I4. The cooling air passes from the chambers of the cylinder cooling-fins II in the direction of the arrows I5. F0r the purpose of guiding the cooling air, guide vanes I6 and baflies 2I, 22 are provided.

Pipe coils c for cooling the lubricating oi1 may be disposed in the space 20. An exhaust-turbine wheel G may be keyed onto the tube III, permitting of utiliSing the energy of the exhaust gases for driving the blowers. Such a modification is shown in Fig. 3, wherein E denotes the exhaust manifold.

The supercharglng-blower impeller 9 also could be secured to the shaft 5 directly (Fig. 4), thus eliminating the tube II). In such a case, the supercharging impeller and also the cooling im peller are preferably connected to the shaft 5 by means cf a resilient coupling R.

What we claim and desire to secure by Letters Patent is:

In an air-cooled supercharged internal combustion engine comprising, a caslng, a plurality of cylinders in line, a cowlins secured t0 the casing and enclosing Parts of. the engine cylinders, a flywheel outside the casing. at one end of the lin of cylinders, a first blower for supplying both cooling air and combustion air, and a second blower for compressing the combustion air, the impellers o1 both blowers being fixed to a common shaft which is journaled in the engine casing and driven by the engine, and the air supplied by the first blower being conducted in two parallel branches, one of the latter supplying engine cooling air and the other engine combustion air, the improvement comprlsing disposing the second blower immediately adjacent that engine cylinder which is next to the fiywheel, and forming the conduit which conducts the air from the first blower along the said shaft to the second blower as part of the engine cowling, said cowling having bafiles which separate said conduit from th engine cylinders, so that the aii passing to the second blower through said conduit does not contact any cf the cylinder walls.

HANS WIEDEIRKEHR. REINE FEISS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1598867 Lundelius Sept. 7, 1926 1.704,082 Goode Mar. 5, 1929 1.907,454 Squires May 9, 1933 1934,385 Strauss Nov. 7, 1933 1.961,905 Michell June 5, 1934 2160281 Price --------------May 30, 1939 2,168,726 Whittle Aug. 8, 1939 2321097 Mills June 8, 1943 2336,844 Buck Dec. 14, 1943 2340,396 McDonnell, Jr. Feb. 1, 1944 2366365 Sorensen Jan. 2, 1945 2384088 Hagen Sept. 4, 1945 2384381 Jocelyn -a Sept. 4, 1945 2427,284 Jocelyn Sept. 9. 1947 

